Cuba will administer experimental COVID-19 shots to nearly the entire population of the capital Havana by May as health authorities carry out massive interventional studies and late stage trials, officials said on Tuesday.Cuba, which has a long history of developing and exporting vaccines, this month began late phase trials of two of its five experimental shots, Soberana 2 and Abdala, which will be Latin America’s first homegrown COVID-19 vaccines if they prove successful.Ileana Morales, the health ministry’s director of science and technological innovation, said on a roundtable broadcast on state television that authorities would conduct an intervention study in 1.7 million people in Havana by May.That comes on top of one it has already.